And, that's the reason the script fails, and the reason I've filed this ticket. The 'postgres' schema doesn't match any in the candidates list. I truly don't believe this is a path issue, given the information above. A thread I started on the trac-users mailing list can be found archived here, in case it helps to fill in any gaps: http://www.gossamer-threads.com/lists/trac/users/48799